Labyrinth Plumb Line Metal Sign

About the Plumb Line design

Concentric rings of fine line fill a perfect circle, chopped into short arcs and stubby radial spokes that jog outward in little stair steps. The way in sits at the top, just right of center, where the outer rim breaks at a small notch. At the middle waits an empty round chamber, its wall parted by one gap on the lower right. Directly below it, a lone straight wall drops to the bottom rim, true as a hanging plumb line.